Troubleshooting
If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:
1 Find "Mobile networks"
Slide two fingers down the display starting from the top edge of your mobile phone.
Press the settings icon.
Press the settings icon.
Press More.
Press Mobile networks.
2 Activate or deactivate data roaming
Press Data roaming to activate or deactivate the function.
If you activate data roaming:
Press OK to confirm.
Press OK to confirm.
3 Return to the Home screen
Press the home icon to end the session and return to the Home screen.